#找原音
vowels=['a','e','i','o','u']
word=input('provide a word to search for vowels:')
found=[]
for letter in word:
    if letter in vowels:
        if letter not in found:
            found.append(letter)
for vowel in found:
    print(vowel)

#利用字典找原音
found={'a','e','i','o','u'}
for letter in word:
    if letter in vowels:
        if letter not in found:
            found[letter]=letter
for vowel in found:
    print(vowel)

#利用字典统计原音出现次数
found={'a':0,'e':0,'i':0,'o':0,'u':0}
print(word)
for letter in word:
    if letter in vowels:
        if letter in found.keys():
            found[letter]+=1
print(found)